Electric caster



FIG. 1 is a bottom, front, left side perspective view of an electric caster showing our new design;

FIG. 2 is a top, rear, right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is an enlarged left side elevation view thereof;

FIG. 6 is an enlarged right side elevation view thereof;

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof. 

CLAIM The ornamental design for an electric caster, as shown and described. 